src/org/cacert/gigi/email/EmailProvider.java

   1 package org.cacert.gigi.email;
   2
   3 import java.io.BufferedReader;
   4 import java.io.IOException;
   5 import java.io.InputStreamReader;
   6 import java.io.PrintWriter;
   7 import java.net.Socket;
   8 import java.security.GeneralSecurityException;
   9 import java.security.Key;
  10 import java.security.PrivateKey;
  11 import java.security.cert.Certificate;
  12 import java.security.cert.X509Certificate;
  13 import java.sql.PreparedStatement;
  14 import java.sql.SQLException;
  15 import java.util.Properties;
  16 import java.util.regex.Pattern;
  17
  18 import javax.naming.NamingException;
  19
  20 import org.cacert.gigi.crypto.SMIME;
  21 import org.cacert.gigi.database.DatabaseConnection;
  22 import org.cacert.gigi.util.DNSUtil;
  23
  24 public abstract class EmailProvider {
  25
  26     public abstract void sendmail(String to, String subject, String message, String from, String replyto, String toname, String fromname, String errorsto, boolean extra) throws IOException;
  27
  28     private static EmailProvider instance;
  29
  30     private X509Certificate c;
  31
  32     private PrivateKey k;
  33
  34     protected final void init(Certificate c, Key k) {
  35         this.c = (X509Certificate) c;
  36         this.k = (PrivateKey) k;
  37     }
  38
  39     protected final void sendSigned(String contents, PrintWriter output) throws IOException, GeneralSecurityException {
  40         SMIME.smime(contents, k, c, output);
  41     }
  42
  43     public static EmailProvider getInstance() {
  44         return instance;
  45     }
  46
  47     protected static void setInstance(EmailProvider instance) {
  48         EmailProvider.instance = instance;
  49     }
  50
  51     public static void initSystem(Properties conf, Certificate cert, Key pk) {
  52         try {
  53             Class<?> c = Class.forName(conf.getProperty("emailProvider"));
  54             EmailProvider ep = (EmailProvider) c.getDeclaredConstructor(Properties.class).newInstance(conf);
  55             ep.init(cert, pk);
  56             instance = ep;
  57         } catch (ReflectiveOperationException e) {
  58             e.printStackTrace();
  59         }
  60     }
  61
  62     public static final String OK = "OK";
  63
  64     public static final String FAIL = "FAIL";
  65
  66     public static final Pattern MAIL = Pattern.compile("^([a-zA-Z0-9])+([a-zA-Z0-9\\+\\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\\._-]+)+$");
  67
  68     public String checkEmailServer(int forUid, String address) throws IOException {
  69         if (MAIL.matcher(address).matches()) {
  70             String[] parts = address.split("@", 2);
  71             String domain = parts[1];
  72
  73             String[] mxhosts;
  74             try {
  75                 mxhosts = DNSUtil.getMXEntries(domain);
  76             } catch (NamingException e1) {
  77                 return "MX lookup for your hostname failed.";
  78             }
  79
  80             for (String host : mxhosts) {
  81                 try (Socket s = new Socket(host, 25); BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream())); PrintWriter pw = new PrintWriter(s.getOutputStream())) {
  82                     String line;
  83                     while ((line = br.readLine()) != null && line.startsWith("220-")) {
  84                     }
  85                     if (line == null || !line.startsWith("220")) {
  86                         continue;
  87                     }
  88
  89                     pw.print("HELO www.cacert.org\r\n");
  90                     pw.flush();
  91
  92                     while ((line = br.readLine()) != null && line.startsWith("220")) {
  93                     }
  94
  95                     if (line == null || !line.startsWith("250")) {
  96                         continue;
  97                     }
  98                     pw.print("MAIL FROM: <returns@cacert.org>\r\n");
  99                     pw.flush();
 100
 101                     line = br.readLine();
 102
 103                     if (line == null || !line.startsWith("250")) {
 104                         continue;
 105                     }
 106                     pw.print("RCPT TO: <" + address + ">\r\n");
 107                     pw.flush();
 108
 109                     line = br.readLine();
 110                     pw.print("QUIT\r\n");
 111                     pw.flush();
 112
 113                     try {
 114                         PreparedStatement statmt = DatabaseConnection.getInstance().prepare("insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
 115                         statmt.setString(1, address);
 116                         statmt.setString(2, line);
 117                         statmt.setInt(3, forUid);
 118                         statmt.execute();
 119                     } catch (SQLException e) {
 120                         e.printStackTrace();
 121                     }
 122
 123                     if (line == null || !line.startsWith("250")) {
 124                         return line;
 125                     } else {
 126                         return OK;
 127                     }
 128                 }
 129
 130             }
 131         }
 132         try {
 133             PreparedStatement statmt = DatabaseConnection.getInstance().prepare("insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
 134             statmt.setString(1, address);
 135             statmt.setString(2, "Failed to make a connection to the mail server");
 136             statmt.setInt(3, forUid);
 137             statmt.execute();
 138         } catch (SQLException e) {
 139             e.printStackTrace();
 140         }
 141         return FAIL;
 142     }
 143
 144 }